The TX bracket allows you to fabricate tee or cross combinations in the ET/ET3/ET5 tray. Simply make the appropriate cuts in the side wall of the tray you are joining a length to, bend down the side wall, and attach a TX bracket either side. This publication is intended as a practical guide for the proper and safe* installation of cable ladder systems, cable tray systems, channel support systems and associated supports. The. en completely installed, without damage either to conductors or structural system use maintain spacing or to keep cables in place when the tray is ect the minimum bend ra-dius for cables as they exit the bottom of the cable tray. How to calculate the perfect gusset tee every time. Great if you are new or just forgot how to do it, this easy to follow gu.